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WO2005102238A1 - Articles absorbants jetables a indicateurs d'humidite imprimes - Google Patents

Articles absorbants jetables a indicateurs d'humidite imprimes Download PDF

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Publication number
WO2005102238A1
WO2005102238A1 PCT/US2005/013343 US2005013343W WO2005102238A1 WO 2005102238 A1 WO2005102238 A1 WO 2005102238A1 US 2005013343 W US2005013343 W US 2005013343W WO 2005102238 A1 WO2005102238 A1 WO 2005102238A1
Authority
WO
WIPO (PCT)
Prior art keywords
graphic
composition
article
weight
absorbent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2005/013343
Other languages
English (en)
Inventor
Kuang-Kai Liu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Procter and Gamble Co
Original Assignee
Procter and Gamble Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Procter and Gamble Co filed Critical Procter and Gamble Co
Priority to EP05736933A priority Critical patent/EP1750638A1/fr
Priority to JP2007507575A priority patent/JP2007532203A/ja
Priority to CN2005800114410A priority patent/CN1942155B/zh
Publication of WO2005102238A1 publication Critical patent/WO2005102238A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/42—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators with wetness indicator or alarm
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/42—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators with wetness indicator or alarm
    • A61F2013/422—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators with wetness indicator or alarm the alarm being a colour change
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/30—Inkjet printing inks

Definitions

  • the present invention relates to a disposable absorbent article comprising a wetness indicator disposed between the absorbent core and the backsheet and in liquid communication with the absorbent core; the wetness indicator comprising a central graphic and a background graphic; wherein the background graphic comprises at least one responsive color composition that, upon wetting, exhibits a visible change that is selected from the group consisting of a color change, a graphic change, and combinations thereof.
  • the background graphic comprises at least one responsive color composition that, upon wetting, exhibits a visible change that is selected from the group consisting of a color change, a graphic change, and combinations thereof.
  • the graphics have been printed directly on a component of the backsheet or have been printed on a separate layer, such as a tissue layer, which is disposed on the backsheet.
  • a tissue layer which is disposed on the backsheet.
  • the graphics can improve the appearance and appeal of the product, to both the wearer and the purchaser.
  • Graphics can also impact the manner in which a disposable absorbent article is used.
  • graphics on disposable diapers can be used by caregivers to amuse and/or educate a child during diapering.
  • graphics on disposable training pants can provide educational and motivational mechanisms to facilitate the toilet training process.
  • Graphics on training pants can also serve to increase the child's interest in the product and thereby increase the child's interest in the toilet training process.
  • Graphics can further be used to indicate when a urine insult has occurred. For instance, it has been known in the art that upon wetting, disposable absorbent articles like diapers have included graphics that appear or disappear to indicate the insult. To date, however, it has not been possible to deliver disposable absorbent products which include printed graphics that can change appearances upon exposure to liquid.
  • the present invention therefore, relates to disposable absorbent articles comprising: a) a liquid pervious topsheet; b) a liquid impervious backsheet that is at least partially joined to the topsheet; c) an absorbent core disposed at least partially between the topsheet and the backsheet; and d) a wetness indicator disposed between the absorbent core and the backsheet and in liquid communication with the absorbent core; the wetness indicator comprising a central graphic and a background graphic; wherein the background graphic comprises at least one responsive color composition and that, upon wetting, exhibits a visible change that is selected from the group consisting of a color change, a graphic change, and combinations thereof.
  • FIGURE 1 illustrates the wetness indicator of the present invention that changes color upon wetting.
  • FIGURES 2 and 3 illustrate a wetness indicator according to the present invention wherein the background graphic is a series of large and small bubbles that upon wetting becomes a series of raindrops and small bubbles.
  • FIGURE 4 illustrate a wetness indicator according to the present invention wherein the background graphic of small and large bubbles in series changes to raindrops within the large bubbles, upon wetting.
  • FIGURES 5 and 6 illustrate instances where the wetness indicator of the present invention includes a background graphic which morphs into an entirely different central graphic upon wetting.
  • absorbent articles refers to devices that absorb and contain body exudates, and, more specifically, refers to devices that are placed against or in proximity to the body of the wearer to absorb and contain the various exudates discharged from the body.
  • Absorbent articles may include diapers, training pants, adult incontinence undergarments, feminine hygiene products, breast pads, care mats, bibs, wound dressing products, and the like.
  • body fluids or “body exudates” includes, but is not limited to, urine, blood, vaginal discharges, breast milk, sweat and fecal matter.
  • the term "absorbent core” refers to the component of the absorbent article that is primarily responsible for fluid handling properties of the article, including acquiring, transporting, distributing and storing body fluids. As such, the absorbent core typically does not include the topsheet, backsheet or outer cover of the absorbent article.
  • the term “bonded” refers to different materials being attached (cohesively or adhesively) in at least a portion thereof. The attached portions may be random or may have a pattern such as stripes, spirals, dots, and the like. The attached portions may be located at the peripheries, throughout the surface area, or both.
  • Suitable attachment means known in the art may be used, including but not limited to adhesives, heat, pressure, crimping, ultrasonic, chemical (via hydrogen bonds or other cohesive forces), mechanical (e.g., fasteners, entanglements), hydraulic, vacuum and combinations thereof.
  • composite structure refers to a multi-region structure wherein the materials comprising the regions may be operatively associated or bonded. The regions may even be in intimate contact such that the composite has a unitary structure. Further, the regions may be positioned in a layered (face-to-face) arrangement, or a side-by-side arrangement.
  • the term "disposable” is used in its ordinary sense to mean an article that is disposed or discarded after a limited number of usage events over varying lengths of time, preferably less than about 20 events, more preferably less than about 10 events, even more preferably less than about 5 events, and most preferably less than about 2 events.
  • the term "intimate bonding” refers to physical contact between two layers such that they resist separation with no readily visually identifiable areas of separation.
  • the inner and outer layers are adhesively laminated together in the graphic regions using a meltblowing process to fonn an overlapping network of adhesive filaments.
  • the tenn “joined” encompasses configurations wherein an element is directly secured to the other element by affixing the element directly to the other element, and configurations wherein the element is indirectly secured to the other element by affixing the element to intermediate member(s), which in turn are affixed to the other element.
  • the term “macroporous” refers to materials having pores too large to effect capillary transport of fluid, generally having pores greater than about 0.5 mm in diameter and, more specifically, having pores greater than about 1.0 mm in diameter.
  • meltblown and “meltblown web” refer to a web having fibers formed by extruding a molten thermoplastic material through a plurality of fine, usually circular, die capillaries as molten threads or filaments into converging high velocity heated gas/air streams which attenuate the molten filaments to reduce their diameter.
  • the reduction in fiber diameter is substantially greater then the reduction of fiber diameter in the spunbonding process, resulting in ' microfibers having average fiber diameter larger than 0.2 microns and typically in the range of 0.6 to 10 microns.
  • the meltblown fibers are carried by the high velocity gas stream and are deposited on a collecting surface to form a web of randomly disbursed fibers.
  • meltblown processes are known in the art.
  • icroporous refers to materials which are capable of transporting fluids by capillary action.
  • nonwoven and “nonwoven web” refers to a web that has a structure of individual fibers which are interlaid forming a matrix, but not in an identifiable repeating manner. Nonwoven webs may be formed by a variety of processes known to those skilled in the art, for example, meltblowing, spunbonding, wet-laying, air-laying, and various bonding-carding processes.
  • operatively associated refers to a structure comprising different materials positioned at least in partial contact with each other in use.
  • the materials are physically separable and each exhibits properties that can be measured individually.
  • the materials may be arranged in a face-to-face relationship in the z-dimension, or in a side-by-side relationship in the xy-dimension.
  • the term "pulp" or "cellulosic fibers” include those natural fiber derived from trees or vegetations (e.g., hardwood fibers, softwood fibers, hemp, cotton, flax, esparto grass, milkweed, straw, bagasse and the like), their processed/regenerated fibers (e.g., Rayon®) or chemically derivatized fibers (e.g., cellulose esters), and combinations thereof.
  • Suitable hardwood fibers include eucalyptus fibers.
  • Suitable hardwood fibers may be prepared by kraft or other chemical pulping methods.
  • Suitable softwood fibers include southern softwood (SS) fibers and northern softwood (NS) fibers.
  • Softwood fibers for use herein can be chemically (e.g., without limitation, kraft pulp) or mechanically pulped (e.g., without limitation, chemithennal mechanical pulp (CTMP) and thermal mechanical pulp (TMP)).
  • CTMP chemithennal mechanical pulp
  • TMP thermal mechanical pulp
  • the term "region" refers to a zone or an area comprising a material being physically, chemically, or visually distinguishable from surrounding or adjoining materials.
  • Various regions of materials may include transitional regions in between. The regions may be positioned in the z-dimension or in the xy-dimension.
  • the term "z-dimension” refers to the dimension orthogonal to the length and width of the structure or article.
  • the z- dimension usually corresponds to the thickness of the structure or article.
  • the term “xy-dimension” refers to the plane orthogonal to the thickness of the member, core or article when the member, core or article is in a flat-out state.
  • the xy-dimension usually corresponds to the length and width, respectively, of the structure or article in a flat-out state.
  • spunbond and “spunbonded web” refers to a web having fibers formed by extruding a molten thermoplastic material as filaments from a plurality of fine capillaries of a spinnerette having a circular or other configuration, then rapidly reducing the diameter of the extruded filaments by fluid drawing or other well known spunbonding mechanisms.
  • Spunbond fibers are quenched and generally not tacky when they are deposited onto a collecting surface.
  • Spunbond fibers are generally continuous and often have average between about 10 to about 30 microns.
  • unitary structure refers to a structure comprising materials having different characteristics joined together to form an integral entity such that the materials are substantially inseparable physically, and the unitary structure exhibits properties resulting from the combination of the materials therein.
  • the materials may be arranged in a face-to-face relationship in the z-dimension, or in a side-by-side relationship in the xy-dimension.
  • the absorbent articles of the present invention comprise a liquid pervious topsheet, a liquid impervious backsheet that is at least partially joined to the topsheet, an absorbent core disposed at least partially between the topsheet and the backsheet, and a wetness indicator printed onto a surface of said backsheet; the wetness indicator comprising a central graphic and a background graphic; wherein the background graphic comprises at least one responsive color composition and that, upon wetting, exhibits a visible change that is selected from the group consisting of a color change, a graphic change, and combinations thereof.
  • the absorbent articles may additionally include one or more components selected from the group consisting of an outer cover, side panels, a cuff, an elastic feature, a fastening system, and combinations thereof.
  • the main body of an absorbent article e.g., a diaper, comprises at least the absorbent core, and the topsheet.
  • An outer cover forms the chassis, onto which other components of the diaper are added to form the unitary structure of the diaper.
  • the article may be preformed by the manufacturer to create a pant.
  • a pant may be placed in position on the wearer by inserting the wearer's legs into the leg openings and sliding the pant into position about the wearer's lower torso.
  • a pant may be preformed by any suitable technique including, but not limited to, joining together portions of the article using refastenable and/or non-refastenable bonds (e.g., seam, weld, adhesive, cohesive bond, fastener, etc.).
  • refastenable and/or non-refastenable bonds e.g., seam, weld, adhesive, cohesive bond, fastener, etc.
  • pants are also commonly referred to as “closed diapers”, “prefastened diapers”, “pull-on diapers”, “training pants” and “diaper-pants”. Suitable pants are disclosed in U.S. Patent Nos.
  • the absorbent articles of the present invention comprise a topsheet.
  • the topsheet is preferably compliant, soft feeling, and non-irritating to the wearer's skin. It can be elastically stretchable in one or two directions. Further, the topsheet is liquid pervious, permitting liquids (e.g., menses, urine, and/or runny feces) to readily penetrate through its thickness.
  • a suitable topsheet can be manufactured from a wide range of materials such as woven and nonwoven materials; apertured or hydroformed thermoplastic films; porous foams; reticulated foams; reticulated thermoplastic films; and thermoplastic scrims.
  • Suitable woven and nonwoven materials may comprise of natural fibers such as wood or cotton fibers; synthetic fibers such as polyester, polypropylene, or polyethylene fibers; or combinations thereof. If the topsheet includes fibers, the fibers may be spunbond, carded, wet-laid, meltblown, hydroentangled, or otherwise processed as is known in the art.
  • topsheet comprising a web of staple-length polypropylene fibers is manufactured by Veratec, Inc., a Division of International Paper Company, of Walpole, MA under the designation P-8.
  • Preferred topsheet for use in the present invention are selected from high loft nonwoven topsheets and apertured film topsheet.
  • Apertured film topsheet typically are pervious to bodily exudates, yet non-absorbent, and have a reduced tendency to allow fluids to pass back through and rewet the wearer's skin.
  • Suitable apertured films include those described in U. S. Pat. Nos. 5628097, 5916661, 6545197, 6107539, and PCT Patent Publication WO 00/69382 A2.
  • suitable topsheet materials for depositing solid excretions thereon may include nonwovens having apertures, which are at least in the portions that are aligned with the feces deposition region of the article. Suitable apertured nonwovens are described in more detail in U.S. Patents 6414215, 5342338, and 5941864 and U.S. Patent Publication 2002/017376.
  • such topsheets can be combined with feces handling members, e.g. underlying such topsheets, and which are further described in the abovementioned patent documents.
  • Suitable formed film topsheets are described in U.S. Pat. Nos. 3929135, 4324246, 4342314, 4463045, 5006394.
  • topsheets may be made in accordance with U.S. Pat. Nos. 4609518 and 4629643. Such formed films are available from The Procter & Gamble Company of Cincinnati, Ohio as “DRI- WEAVE” and from Tredegar Corporation, based in Richmond, VA, as "CLIFF-T.”
  • DRI- WEAVE The Procter & Gamble Company of Cincinnati, Ohio as "DRI- WEAVE” and from Tredegar Corporation, based in Richmond, VA, as "CLIFF-T.”
  • the topsheet is made of a hydrophobic material, preferably at least a portion of the upper surface of the topsheet is treated to be hydrophilic so that liquids will transfer through the topsheet more rapidly.
  • the topsheet can be rendered hydrophilic by treating it with a surfactant or by incorporating a surfactant into the topsheet.
  • Suitable methods for treating the topsheet with a surfactant include spraying the topsheet material with the surfactant and/or immersing the material into the surfactant.
  • a more detailed discussion of such a treatment and hydrophilicity is contained in U.S. Pat. Nos. 4988344, 4988345, and 4950254.
  • a more detailed discussion of some suitable methods for incorporating a surfactant in the topsheet 24 can be found in U.S. Statutory Invention Registration No. H1670.
  • the topsheet may include an apertured web or film which is hydrophobic.
  • topsheet such as a polytetraflouroethylene compound like SCOTCHGUARD or a hydrophobic lotion composition, as described below.
  • a hydrophobic treatment such as a polytetraflouroethylene compound like SCOTCHGUARD or a hydrophobic lotion composition, as described below.
  • the apertures be large enough to allow the penetration of aqueous fluids like urine without significant resistance.
  • Any portion of the topsheet may be coated with a lotion as is known in the art. Examples of suitable lotions include those described in U.S. Pat. Nos. 5607760, 5609587, 5635191, 5643588, and 5968025.
  • the lotion may function alone or in combination with another agent as the hydrophobizing treatment described above.
  • the topsheet may also include or be treated with antibacterial agents, some examples of which are disclosed in PCT Publication No. WO 95/24173. Further, the topsheet, the outer cover or any portion of the topsheet or outer cover may be embossed and/or matte finished to provide a more cloth like appearance.
  • the topsheet may comprise one or more apertures to ease penetration of exudates therethrough, such as urine and/or feces (solid, semi-solid, or liquid). The size of at least the primary aperture is important in achieving the desired waste encapsulation performance. If the primary aperture is too small, the waste may not pass through the aperture, either due to poor alignment of the waste source and the aperture location or due to fecal masses having a diameter greater than the aperture.
  • the aperture should have an area of between about 10 cm2 and about 50 cm2.
  • the aperture preferably has an area of between about 15 cm2 and 35 cm2.
  • the topsheet may be fully or partially elasticated or may be foreshortened so as to provide a void space between the topsheet and the core. Exemplary structures including elasticized or foreshortened topsheets are described in more detail in U.S. Pat. Nos. 4892536, 4990147, 5037416, and 5269775.
  • the backsheet is preferably impervious to fluids (e.g., menses, urine, and/or runny feces) and is preferably manufactured from a thin plastic film, although other flexible liquid impervious materials may also be used.
  • fluids e.g., menses, urine, and/or runny feces
  • flexible refers to materials which are compliant and will readily conform to the general shape and contours of the human body.
  • the backsheet prevents the exudates absorbed and contained in the absorbent core from wetting articles which contact the absorbent article such as bedsheets, pants, pajamas and undergarments.
  • the backsheet may thus comprise a woven or nonwoven material, polymeric films such as thermoplastic films of polyethylene or polypropylene, and/or composite materials such as a film- coated nonwoven material (i.e., having an inner film layer and an outer nonwoven layer).
  • a suitable backsheet is a polyethylene film having a thickness of from about 0.012 mm (0.5 mils) to about 0.051 mm (2.0 mils).
  • Exemplary polyethylene films are manufactured by Clopay Corporation of Cincinnati, Ohio, under the designation BR-120 and BR-121 and by Tredegar Film Products of Terre Haute, Ind., under the designation XP-39385.
  • the backsheet is preferably embossed and/or matte-finished to provide a more clothlike appearance.
  • the backsheet may permit vapors to escape from the absorbent core (i.e., the backsheet is breathable) while still preventing exudates from passing through the backsheet.
  • the size of the backsheet is dictated by the size of the absorbent core and the exact absorbent article design selected.
  • the backsheet and the topsheet are positioned adjacent a garment surface and a body surface, respectively, of the absorbent core.
  • the absorbent core is preferably joined with the topsheet, the backsheet, or both in any manner as is known by attachment means such as those well known in the art. However, embodiments of the present invention are envisioned wherein portions of the entire absorbent core are unattached to one or both of the topsheet and the backsheet.
  • the backsheet and/or the topsheet may be secured to the absorbent core or to each other by a uniform continuous layer of adhesive, a patterned layer of adhesive, or an array of separate lines, spirals, or spots of adhesive.
  • Adhesives which have been found to be satisfactory are manufactured by H. B. Fuller Company of St. Paul, Minn, under the designation HL-1258 or H-2031.
  • the attachment means will preferably comprise an open pattern network of filaments of adhesive as is disclosed in US Pat. No. 4573986.
  • An exemplary attachment means of an open pattern network of filaments comprises several lines of adhesive filaments swirled into a spiral pattern such as illustrated by the apparatus and method shown in US Pat. Nos. 3911173, 4785996 and 4842666.
  • the attachment means may comprise heat bonds, pressure bonds, ultrasonic bonds, dynamic mechanical bonds, or any other suitable attachment means or combinations of these attachment means as are known in the art.
  • the backsheet preferably includes an inner and outer layer, each of which can be bonded to the other by a variety of means known in the art, including thermal bonds, adhesive bonds, ultrasonic lamination, or the like. Intimate bonding of the inner and outer layers in the graphic regions reduces light diffraction and thus improves the brightness and overall visibility of the wetness indicator graphic. Adhesive bonding can also be accomplished using adhesive slot coating, high frequency oscillation patterns, for example in swirl or spray patterns, and other fine denier and/or high coverage application techniques.
  • Suitable laminate adhesives which can be applied continuously or intermittently, can be obtained from Findley Adhesives, Inc. or from National Starch and Chemical Company.
  • the outer layer of the backsheet can be made in a variety of forms using different processes.
  • the outer layer may be formed as a carded web, a bonded carded web, a spunbond web, a needled fabric, a woven fabric, or the like to provide a generally cloth-like texture to the wearer.
  • Other additives such as titanium dioxide can represent about 0.5% or less, particularly about 0.3% or less, of the outer layer.
  • the outer layer comprises a spunbond web formed of about 99.5 to 100% polypropylene resin and about 0.5% or less other additives.
  • the outer layer is desirably a lightweight material having a basis weight of about 15 to about 30 gsm and more preferably from about 15 to about 25 gsm.
  • ABSORBENT CORE The articles of the present invention additionally comprise one or more absorbent cores.
  • the absorbent core is at least partially disposed between the topsheet and the backsheet and may take on any size or shape that is compatible with the disposable absorbent article. Exemplary absorbent structures for use as the absorbent core of the present invention that have achieved wide acceptance and commercial success are described in US Pat. Nos. 4610678, 4673402, and 4888231, and 4834735.
  • the absorbent core may further comprise the dual core system containing an acquisition/distribution core of chemically stiffened fibers positioned over an absorbent storage core as detailed in U.S. Pat. Nos. 5234423 and 5147345.
  • the absorbent core is capable of absorbing or retaining liquids (e.g., menses, urine, and/or other body exudates).
  • the absorbent core is preferably compressible, conformable, and non-irritating to the wearer's skin.
  • the absorbent core may be manufactured in a wide variety of sizes and shapes (e.g., rectangular, oval, hourglass, "T" shaped, dog bone, asymmetric, etc.).
  • the absorbent core may include any of a wide variety of liquid-absorbent materials commonly used in absorbent articles, such as comminuted wood pulp, which is generally referred to as airfelt.
  • suitable absorbent materials for use in the absorbent core include creped cellulose wadding; meltblown polymers including coform; chemically stiffened, modified or cross-linked cellulosic fibers; synthetic fibers such as crimped polyester fibers; peat moss; tissue including tissue wraps and tissue laminates; absorbent foams; absorbent sponges; superabsorbent polymers; absorbent gelling materials; or any equivalent material or combinations of materials, or mixtures of these.
  • absorbent gelling materials and “superabsorbent polymers” are those materials that, upon contact with aqueous fluids, such as bodily fluids, imbibes such fluids and form hydrogels. These absorbent gelling materials are typically capable of absorbing large quantities of aqueous bodily fluids, and further capable of retaining such absorbed fluids under moderate pressures. These absorbent gelling materials are typically in the form of discrete, nonfibrous particles. Other forms, such as fibers, foams, sheets, strips, or other macrostructures, are also suitable for use herein. Suitable absorbent gelling materials in the form of open cell foams may include those disclosed in U.S. Pat. Nos.
  • the configuration and construction of the absorbent core may also be varied (e.g., the absorbent core may have varying caliper zones and/or have a profile so as to be thicker in the center; hydrophilic gradients; superabsorbent gradients; or lower average density and lower average basis weight zones, e.g., acquisition zones; or may comprise one or more layers or structures).
  • the total absorbent capacity of the absorbent core should, however, be compatible with the design loading and the intended use of the absorbent article.
  • the size and absorbent capacity of the absorbent core may be varied to accommodate different uses such as diapers, incontinence pads, pantiliners, regular sanitary napkins, and overnight sanitary napkins, and to accommodate wearers ranging from infants to adults.
  • the absorbent core can include other absorbent components that are often used in absorbent articles, for example, a dusting layer, a wicking or acquisition layer, or a secondary topsheet for increasing the wearer's comfort.
  • the absorbent article may also include a sublayer disposed between the topsheet and the backsheet.
  • the sublayer may be any material or structure capable of accepting, storing or immobilizing bodily exudates.
  • the sublayer may include a single material or a number of materials operatively associated with each other. Further, the sublayer may be integral with another element of the absorbent article or may be one or more separate elements joined directly or indirectly with one or more elements of the article. Further, the sublayer may include a structure that is separate from the core or may include or be part of at least a portion of the core.
  • Suitable materials for use as the sublayer may include large cell open foams, macro- porous compression resistant nonwoven highlofts, large size particulate forms of open and closed cell foams (macro and/or microporous), highloft nonwovens, polyolefin, polystyrene, polyurethane foams or particles, structures comprising a multiplicity of vertically oriented looped strands of fibers, absorbent core structures described above having punched holes or depressions, and the like.
  • microporous refers to materials which are capable of transporting fluids by capillary action.
  • a sublayer includes a mechanical fastening loop landing element, having an uncompressed thickness of about 1.5 millimeters available as XPL-7124 from the 3M Corporation of Minneapolis, Minnesota.
  • Another embodiment includes a 6 denier, crimped and resin-bonded nonwoven highloft having a basis weight of 110 grams per square meter and an uncompressed thickness of 7.9 millimeters which is available from the Glit Company of Wrens, Georgia.
  • Other suitable absorbent and nonabsorbent sublayers are described in U.S. Patent Nos.
  • the disposable absorbent articles of the present invention further comprise a wetness indicator disposed between the absorbent core and the backsheet and in liquid communication with the absorbent core.
  • the wetness indicator comprises a central graphic and a background graphic wherein the background graphic comprises at least one responsive color composition that, upon wetting, exhibits a visible change that is selected from the group consisting of a color change, a graphic change, and combinations thereof.
  • the central graphic is hidden by the background graphic until such time as the graphic is wetted.
  • FIGURE 1 illustrates a background graphic of a colored bear that once wetted reveals a central graphic of a different colored bear.
  • FIGURE 2 depicts a central graphic of colored raindrops that are revealed upon wetting of a colored larger animated bubbles background graphic.
  • the background graphic may be a different color than the central graphic that is revealed upon wetting as is shown in FIGURE 3.
  • FIGURE 4 similarly illustrates that the background graphic may be wetted to reveal a central graphic that is of an entirely or of a partially different color from the background graphic.
  • each of the larger and smaller bubbles in FIGURE 4 prior to wetting may be blue in color but after wetting only the smaller sized bubbles may change to pink in color while the raindrops within the larger bubbles may appear pink in color while the surrounding larger bubble remains blue in color after wetting.
  • each of the bubbles may be blue in color and upon wetting the raindrops that are revealed may each be a different color from the original blue bubbles and may still be different colors from one another.
  • FIGURES 5 and 6 illustrate how the background graphic may be an entirely different shape and/or color from the central graphic that appears upon wetting of the graphic.
  • a responsive color composition may comprise from about 1% to about 10%, by weight of the composition, of a pigment.
  • the composition comprises from about 2% to about 8% and most preferably from about 3% to about 7% of the pigment.
  • the solid pigments particles used in the present invention include, but not limited to examples, pigment Yellow (C.I. 14), pigment Red (C.I. 48:3), pigment Blue (C.I. 15:4), pigment Black (C.I. 7), and combinations thereof.
  • the responsive color composition also comprises from about 1% to about 10%, by weight of the composition, of a fluid dyestuff. More preferably, the composition comprises from about 2% to about 8% and most preferably from about 3% to about 7% of the fluid dyestuff.
  • Suitable fluid dyestuffs include water soluble ink colorants like direct dyes, acid dyes, base dyes, and various solvent soluble dyes. Examples include, but are not limited to, FD&C Blue 1 (C.I. 42090:2), D&C Red 6(C.I. 15850), D&C Red 7(C.I. 15850:1), D&C Red 9(C.I. 15585:1), D&C Red 21(C.I. 45380:2), D&C Red 22(C.I. 45380:3), D&C Red 27(C.I. 45410:1), D&C Red 28(C.I. 45410:2), D&C Red 30(C.I. 73360), D&C Red 33(C.I.
  • the responsive color composition comprises from about 10% to about 99% of a solvent.
  • the composition comprises from about 30% to about 85% and even more preferably from about 40% to about 75% of a solvent.
  • the solvents of the present invention may be selected from the group consisting of water, non-aqueous solvents, and combinations thereof.
  • Preferred non-aqueous solvents may comprise alcohols, acetates, and combinations thereof.
  • the alcohol solvents are preferably selected from the group consisting of iso-propyl alcohol, n-propyl alcohol, ethanol, methanol, and combinations thereof.
  • suitable acetate solvents include, but are not limited to, isopropyl acetate, n- propyl acetate, and combinations thereof.
  • An exemplary ink that can be used to dispose both the central and background graphics on a substrate is commercially available from Osaka Printing Industries as Omutsu-you-G ICC pants-you Hkonku v/M (translated from Japanese to English).
  • the responsive color composition comprises from about 1% to about 10%, by weight of the composition, of a fluid dyestuff and from about 10% to about 99%, by weight of the composition, of a solvent.
  • a pigment in the responsive color composition such a composition shall be disposed adjacent to a varnish coating, which is detailed herein.
  • the responsive color composition comprises from about 2% to about 8% of a fluid dyestuff, even more preferably from about 2.5% to about 7%, and most preferably from about 3% to about 6%.
  • it is more preferred that such a composition comprise from about 30% to about 80%) of a solvent and even more preferred that it comprise 40% to about 75%.
  • the central graphic may additionally comprise additional responsive color compositions that includes the same or similar constituents as the first responsive color composition.
  • the articles of the present invention may further comprise a permanent color composition, particular in the wetness indicator.
  • This permanent color composition comprises from about 1%> to about 10%>, by weight of the composition, of a pigment. Suitable pigments include those that are discussed relative to the responsive color composition.
  • the permanent color composition additionally comprises a non-aqueous solvent in an amount of from about 10% to about 99%, preferably from about 30%> to about 80%, and most preferably from about 40% to about 75%. Again, those solvents that are suitable herein are similar to those discussed for the responsive color composition.
  • the responsive color composition of the present invention may be disposed adjacent to a varnish coating. Without being limited by theory, this coating serves as a sealant of sorts for the responsive color composition. Upon contact with an aqueous liquid, the responsive color composition (or ink) of the background graphic dissolves and the central graphic disposed adjacent to the varnish coating is not affected by the liquid. The central graphic then becomes apparent upon dissolution of the background graphic and maintenance of the varnish coating.
  • Suitable materials for the varnish coating may be selected from the group consisting of acrylic copolymers, shellac-based acrylic resins, polyamides, and combinations thereof. These materials are intended to be exemplary but not limiting in any way. Additionally, the varnish coating may be disposed over the graphic, beneath the graphic, or both.
  • the varnish coating be disposed adjacent to the graphic such that one or more edges of the coating extend at least about 25% past one or more edges of the graphic. More preferably, the varnish coating extends at least about 15% and most preferably at least about 10% past one or more edges of the graphic.
  • central graphic is used herein to refer to a graphic that becomes visible when the absorbent article is insulted with urine or like fluid. The change in visibility of a graphic or a portion of a graphic can be determined based on a person's observation of the graphic before and after the graphic is exposed to liquid. Backsheet graphics are directly visible on the exterior surface of the absorbent article and have been extremely appealing to children.
  • the background and central graphics are suitably disposed on the backsheet.
  • the term "disposed" and variations thereof are intended to mean that one element can be integral with another element, or that one element can be a separate structure bonded to or placed with or placed near another element.
  • the graphics can be formed or applied directly or indirectly to a surface of the backsheet, formed or applied between layers of a multiple layer backsheet, formed or applied to a substrate that is placed with or near the outer cover, formed or applied within a layer of the backsheet or another substrate, or other variations or combinations thereof.
  • the graphics can be printed (via flexography, gravure, digital printing, etc.), sprayed, or otherwise applied directly on a layer of the outer cover.
  • the graphics can be applied to a layer placed with or near the backsheet, such as a substrate associated with the absorbent assembly, including but not limited to tissue layers, liquid handling layers, absorbent layers, and the like.
  • the graphics can be printed (via flexography, gravure, digital printing, etc.). For such printing, it is envisioned that a multiplicity of additional responsive color compositions may be utilized such that multicolor graphics are achieved upon wetting of the article.
  • preferred speeds for printing range from about 50 m/min to about 500 m/min, preferably from about 100 m/min to about 300 m min. In preferred embodiments, the printing speed is set at about 200 m/min.
  • a multicolor print press is utilized to print the graphic on the backsheet material with the responsive color composition(s) and optional varnish coatings being printed in succession from different print stations.
  • the graphics for use with the present invention can be located on or against either surface of the backsheet provided the graphic(s) remain visible from the exterior of the product before wetting.
  • the central and background graphics can be formed on or applied to the backsheet or another substrate bonded to or placed with or placed near the backsheet by any suitable technique.
  • the background and central graphics are printed on the interior surface of the backsheet.
  • the background graphic can be in liquid communication with the absorbent assembly of the product.
  • liquid communication means that liquid such as urine is able to travel from one layer or element to another layer or element.
  • the absorbent assembly can but need not include a slot or densii ⁇ ed region, incorporate a liquid distribution layer, or the like, to channel or direct liquid to the location near the outer cover where the graphics are located.
  • Absorbent articles suitable for use as the present invention include diapers, training pants, incontinence products, diaper pants, disposable underwear, or the like. Suitable training pants and diaper pants can have seamed side portions or refastenable side portions.
  • the present invention is particularly suited for use with training pants or diaper pants to aid in toilet training.
  • Particular diapers and training pants suitable for use with the present invention are disclosed in U.S. Patent Nos. 3860003, 4636207, 4695278, 4704115, 4795454, 4900317, 4909803 (Reissued as USRE34920), 5085654, 5492751, 6476288, 6627787, 5507760, 5609587, 5635191, 5643588, 6118041, SIR H1630, 5246433, 5769838, 5899895, 5899896, and 6120487. Additional patents discussing suitable training pants are disclosed earlier herein.
  • the absorbent article further comprises at least a first cuff for providing improved containment of liquids and other body exudates; an elastic waist feature that provides improved fit and containment; and a fastening system which forms a side closure which maintains the first waist region and the second waist region in an overlapping configuration such that lateral tensions are maintained around the circumference of the absorbent article to maintain the absorbent article on the wearer.
  • the absorbent article may also comprise elasticized side panels (not shown) in the waist regions and to provide an elastically extensible feature that provides a more comfortable and contouring fit and more effective application of the absorbent article.
  • the "elasticized" leg cuffs can be constructed in a number of different configurations, including those described in US Pat. Nos.
  • the absorbent article may include one ore more first cuffs that provide improved containment of liquids and other body exudates.
  • First cuffs may also be referred to as outer leg cuff, leg bands, side flaps, leg cuffs or elastic cuffs.
  • U.S. Pat. No. 3860003 describes a disposable diaper which provides a contractible leg opening having a side flap and one or more elastic members to provide an elasticized leg cuff.
  • an absorbent article of the present invention may include one or more second cuffs that also provide improved containment of liquids and other body exudates.
  • Second cuffs may also be referred to as barrier leg cuffs, inner leg cuffs or "stand-up" elasticized flaps.
  • U.S. Pat. Nos. 4808178 and 4909803 (Reissued as USRE34920), respectively, describe disposable diapers having "stand-up" elasticized flaps that improve the containment of the leg regions.
  • First cuff and second cuff may both be provided by way of a dual cuff, as exampled in
  • An absorbent article that includes a wetness indicator according to the present invention is produced as follows.
  • a breathable polyolefin film is selected from either of BR-120 and BR-121, which are commercially available from Clopay of Cincinnati, Ohio. Each of these films has a breathability of 1500 to 4000 MVTR and basis weight of 28 gsm and may serve as the material on which printing occurs.
  • a Windmoller & Holscher Olympia 736 ST 6 color printing machine or the equivalent Flexo printer is loaded with a wetness indicator ink, which is a responsive color composition, that includes the following ingredients: Wetness Indicator Ink Solvents: Isopropyl alcohol; 60 ⁇ 10wt% Pigment: Red, C.I.
  • Example 2 An absorbent article that includes a wetness indicator according to the present invention is produced as follows.
  • a breathable polyolefin film is selected from either of BR-120 and BR-121, which are commercially available from Clopay of Cincinnati, Ohio. Each of these films has a breathability of 1500 to 4000 MVTR and basis weight of 28 gsm and may serve as the material on which printing occurs.
  • a Windmoller & Holscher Olympia 736 ST 6 color printing machine or the equivalent Flexo printer is loaded with two wetness indicator inks that include the following ingredients: Wetness Indicator Ink 1 Solvent: Isopropyl alcohol; 60 ⁇ 10wt% Dye: FD&C Blue 1, C.I.
  • wetness indicator ink 1 Upon wetting of such an absorbent article, the blue dye of the wetness indicator ink 1 washes away upon contact with liquid while wetness indicator ink 2 (i.e., a responsive color composition) that is in the printed image dissipates to leave a red colored central graphic.
  • wetness indicator ink 2 i.e., a responsive color composition
  • the background graphic that appears prior to wetting may differ from the central graphic that appears afterwards.
  • Example 3 An absorbent article that includes a wetness indicator according to the present invention is produced as follows.
  • a breathable polyolefin film is selected from either of BR-120 and BR-121, which are commercially available from Clopay of Cincinnati, Ohio. Each of these films has a breathability of 1500 to 4000 MVTR and basis weight of 28 gsm and may serve as the material on which printing occurs.
  • a Windmoller & Holscher Olympia 736 ST 6 color printing machine or the equivalent Flexo printer is loaded with a wetness indicator ink (a responsive color composition) and a varnish coating that each includes the following ingredients.
  • Varnish Coating Solvent Isopropyl acetate; 60 ⁇ 10wt% Polyurethane: 20 ⁇ 5 wt% Polyamide & Silica: 20 ⁇ 5wt % Wetness Indicator Ink (a responsive color composition) Solvents: Isopropyl alcohol; 60 ⁇ 10wt% Dye: FD&C Blue 1 , C.I. 42090:2; 2 ⁇ .5wt% Hydroxypropyl cellulose: 10 ⁇ 3 wt% Silica: 2 ⁇ 0.5 wt%
  • the film is printed with the first wetness indicator graphic and second clear vamish coating with another graphic design at a 3g/sqm add-on weight and at a line speed of 100 m/min.
  • the background graphic appears blue in color.
  • This film is then dried and wound into a roll form and stored. This film is then incorporated into any one of the absorbent articles disclosed in US Patent Nos.
  • Example 4 An absorbent article that includes a wetness indicator according to the present invention is produced as follows.
  • a breathable polyolefin film is selected from either of BR-120 and BR-121, which are commercially available from Clopay of Cincinnati, Ohio. Each of these films has a breathability of 1500 to 4000 MVTR and basis weight of 28 gsm and may serve as the material on which printing occurs.
  • a Windmoller & Holscher Olympia 736 ST 6 color printing machine or the equivalent Flexo printer is loaded with one wetness indicator ink (i.e., a responsive color composition) and one permanent ink (aka permanent color composition) that each includes the following ingredients.
  • Permanent Ink Solvent Isopropyl alcohol; 60 ⁇ 10wt% Pigment: Blue, C.I.
  • the film is printed with the loaded wetness indicator ink and permanent ink at a 3g/sqm add-n weight and at a line speed of 100 m min.
  • the background graphic that appears is bluish purple in color.
  • This film is then dried and wound into a roll form and stored. This film is then incorporated into any one of the absorbent articles disclosed in US Patent Nos.

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  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)

Abstract

La présente invention invention concerne un article absorbant jetable comprenant un indicateur d'humidité disposé entre le noyau absorbant et la feuille arrière et en communication liquide avec le noyau absorbant. L'indicateur d'humidité comprend un élément graphique central et un élément graphique arrière. L'élément graphique arrière comprend au moins une composition couleur sensible qui, lors de son humidification, présente un changement visible sélectionné pouvant être un changement de couleur, un changement graphique, ou une combinaison des deux.
PCT/US2005/013343 2004-04-19 2005-04-19 Articles absorbants jetables a indicateurs d'humidite imprimes Ceased WO2005102238A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP05736933A EP1750638A1 (fr) 2004-04-19 2005-04-19 Articles absorbants jetables a indicateurs d'humidite imprimes
JP2007507575A JP2007532203A (ja) 2004-04-19 2005-04-19 印刷された湿り度インジケータを有する使い捨て吸収性物品
CN2005800114410A CN1942155B (zh) 2004-04-19 2005-04-19 具有印刷湿度指示的一次性吸收制品

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/827,087 US7332642B2 (en) 2004-04-19 2004-04-19 Disposable absorbent articles having printed wetness indicators
US10/827,087 2004-04-19

Publications (1)

Publication Number Publication Date
WO2005102238A1 true WO2005102238A1 (fr) 2005-11-03

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US (5) US7332642B2 (fr)
EP (1) EP1750638A1 (fr)
JP (2) JP2007532203A (fr)
CN (1) CN1942155B (fr)
WO (1) WO2005102238A1 (fr)

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US10695231B2 (en) 2020-06-30
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US20170304126A1 (en) 2017-10-26
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US8940959B2 (en) 2015-01-27
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US20050234414A1 (en) 2005-10-20
CN1942155A (zh) 2007-04-04

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